{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:DZ5677VMSKSWRKVILKG55KVLAM","short_pith_number":"pith:DZ5677VM","canonical_record":{"source":{"id":"2311.16243","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-11-27T19:00:10Z","cross_cats_sorted":[],"title_canon_sha256":"688cdda30add4635e0d4603f2aed6018f067afc9c053cf3247ca18b2cd06534e","abstract_canon_sha256":"642a2286de18a3f6d4c2a0d0714a39ceb80a9ac481f606cceb9ef6dee5cad586"},"schema_version":"1.0"},"canonical_sha256":"1e7beffeac92a568aaa85a8ddeaaab03197d5a4beb5a43bdbdd8453037913578","source":{"kind":"arxiv","id":"2311.16243","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2311.16243","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"arxiv_version","alias_value":"2311.16243v1","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2311.16243","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"pith_short_12","alias_value":"DZ5677VMSKSW","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"pith_short_16","alias_value":"DZ5677VMSKSWRKVI","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"pith_short_8","alias_value":"DZ5677VM","created_at":"2026-07-05T07:41:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:DZ5677VMSKSWRKVILKG55KVLAM","target":"record","payload":{"canonical_record":{"source":{"id":"2311.16243","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-11-27T19:00:10Z","cross_cats_sorted":[],"title_canon_sha256":"688cdda30add4635e0d4603f2aed6018f067afc9c053cf3247ca18b2cd06534e","abstract_canon_sha256":"642a2286de18a3f6d4c2a0d0714a39ceb80a9ac481f606cceb9ef6dee5cad586"},"schema_version":"1.0"},"canonical_sha256":"1e7beffeac92a568aaa85a8ddeaaab03197d5a4beb5a43bdbdd8453037913578","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:41:45.529984Z","signature_b64":"Ph9El2g4ZKJOqxQh52cUr1SZ7vE7zwu8FBJcPuJhbazoZBHXTLHlisJS7IMTBRSn9Z4oLzex0bU5cAbgE7zlDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1e7beffeac92a568aaa85a8ddeaaab03197d5a4beb5a43bdbdd8453037913578","last_reissued_at":"2026-07-05T07:41:45.529562Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:41:45.529562Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2311.16243","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:41:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S2oixFYzHR9iOu3Dj18WRuH5tLdihKr7PV6eih8FRGavHcVcjCeubq5HRSlPCLILqr7saybdH9AEehKL4PwFBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T08:19:15.341783Z"},"content_sha256":"7fbc77fdb8a951c46b531962d45e4f4b3b76bb2fad590a5fa134fb33ca8d04c6","schema_version":"1.0","event_id":"sha256:7fbc77fdb8a951c46b531962d45e4f4b3b76bb2fad590a5fa134fb33ca8d04c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:DZ5677VMSKSWRKVILKG55KVLAM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the nature of the ultraluminous X-ray source Holmberg II X-1","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. G\\'urpide, C. Pinto, D. J. Walton, F. Barra, M. Middleton, T. Di Salvo, T. P. Roberts","submitted_at":"2023-11-27T19:00:10Z","abstract_excerpt":"We present a comprehensive spectral analysis of the ultraluminous X-ray source Holmberg II X-1 using broadband and high-resolution X-ray spectra taken with the XMM-Newton satellite over a period of 19 years benefiting from a recent campaign. We tested several models for the broadband spectra among which a double thermal component provided a reasonable description for the continuum between 0.3-10 keV and enabled us to constrain the properties of the accretion disc. The Luminosity-Temperature trends of the inner and outer disc components broadly agree with the expectations for a thin disc, altho"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2311.16243","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2311.16243/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:41:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c3VAYWxXWcrePgJYqXFI5Ubd6TtZTzfbeLkPzA4q+zTzpTcKi7bVUgbZtFEWVTymrM0Zw0+nFgt27BPZaO7RCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T08:19:15.342283Z"},"content_sha256":"924d40c664e828f8a861151a2485fedad3aaa12019a8d9d45da7fb28c03c1ae7","schema_version":"1.0","event_id":"sha256:924d40c664e828f8a861151a2485fedad3aaa12019a8d9d45da7fb28c03c1ae7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DZ5677VMSKSWRKVILKG55KVLAM/bundle.json","state_url":"https://pith.science/pith/DZ5677VMSKSWRKVILKG55KVLAM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DZ5677VMSKSWRKVILKG55KVLAM/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-06T08:19:15Z","links":{"resolver":"https://pith.science/pith/DZ5677VMSKSWRKVILKG55KVLAM","bundle":"https://pith.science/pith/DZ5677VMSKSWRKVILKG55KVLAM/bundle.json","state":"https://pith.science/pith/DZ5677VMSKSWRKVILKG55KVLAM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DZ5677VMSKSWRKVILKG55KVLAM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:DZ5677VMSKSWRKVILKG55KVLAM","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"642a2286de18a3f6d4c2a0d0714a39ceb80a9ac481f606cceb9ef6dee5cad586","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-11-27T19:00:10Z","title_canon_sha256":"688cdda30add4635e0d4603f2aed6018f067afc9c053cf3247ca18b2cd06534e"},"schema_version":"1.0","source":{"id":"2311.16243","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2311.16243","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"arxiv_version","alias_value":"2311.16243v1","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2311.16243","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"pith_short_12","alias_value":"DZ5677VMSKSW","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"pith_short_16","alias_value":"DZ5677VMSKSWRKVI","created_at":"2026-07-05T07:41:45Z"},{"alias_kind":"pith_short_8","alias_value":"DZ5677VM","created_at":"2026-07-05T07:41:45Z"}],"graph_snapshots":[{"event_id":"sha256:924d40c664e828f8a861151a2485fedad3aaa12019a8d9d45da7fb28c03c1ae7","target":"graph","created_at":"2026-07-05T07:41:45Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2311.16243/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a comprehensive spectral analysis of the ultraluminous X-ray source Holmberg II X-1 using broadband and high-resolution X-ray spectra taken with the XMM-Newton satellite over a period of 19 years benefiting from a recent campaign. We tested several models for the broadband spectra among which a double thermal component provided a reasonable description for the continuum between 0.3-10 keV and enabled us to constrain the properties of the accretion disc. The Luminosity-Temperature trends of the inner and outer disc components broadly agree with the expectations for a thin disc, altho","authors_text":"A. G\\'urpide, C. Pinto, D. J. Walton, F. Barra, M. Middleton, T. Di Salvo, T. P. Roberts","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-11-27T19:00:10Z","title":"On the nature of the ultraluminous X-ray source Holmberg II X-1"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2311.16243","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:7fbc77fdb8a951c46b531962d45e4f4b3b76bb2fad590a5fa134fb33ca8d04c6","target":"record","created_at":"2026-07-05T07:41:45Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"642a2286de18a3f6d4c2a0d0714a39ceb80a9ac481f606cceb9ef6dee5cad586","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-11-27T19:00:10Z","title_canon_sha256":"688cdda30add4635e0d4603f2aed6018f067afc9c053cf3247ca18b2cd06534e"},"schema_version":"1.0","source":{"id":"2311.16243","kind":"arxiv","version":1}},"canonical_sha256":"1e7beffeac92a568aaa85a8ddeaaab03197d5a4beb5a43bdbdd8453037913578","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1e7beffeac92a568aaa85a8ddeaaab03197d5a4beb5a43bdbdd8453037913578","first_computed_at":"2026-07-05T07:41:45.529562Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:41:45.529562Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ph9El2g4ZKJOqxQh52cUr1SZ7vE7zwu8FBJcPuJhbazoZBHXTLHlisJS7IMTBRSn9Z4oLzex0bU5cAbgE7zlDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:41:45.529984Z","signed_message":"canonical_sha256_bytes"},"source_id":"2311.16243","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7fbc77fdb8a951c46b531962d45e4f4b3b76bb2fad590a5fa134fb33ca8d04c6","sha256:924d40c664e828f8a861151a2485fedad3aaa12019a8d9d45da7fb28c03c1ae7"],"state_sha256":"0ba9af3a9ff45afd826b8bd0e63cf7baf08114ac90ac0ef37c762521ee0262c0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SMw6ZEqPotgiD9RpwIc4gpzwglZk2M6W/xCi2AZalWCnBrUY8LdSl/lc1BtxVOFgako0NsbV0/E04dO3eFwOCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T08:19:15.345717Z","bundle_sha256":"8d5448d0e2f9afb60a77af0a646486f5d98e9209fac724b81f10a9e0b3fd58b2"}}